On the Subject of Gridding Gridlock

Thankfully I brought a grid for this exact situation.

See the original manual for instructions related to the module.

Interaction Action
Click a cell To mark it with a number
and the latest color
Click multiple times To change the cell color
Right-click a cell To mark it with the latest color
CTRL-Z To undo a change to the grid
CTRL-Y To redo a change to the grid
Movement Blue Green Yellow Red
BLUE A B C D
1
2
3
4
GREEN A B C D
1
2
3
4
YELLOW A B C D
1
2
3
4
RED A B C D
1
2
3
4